從MKMapView獲取用戶位置

Question

是否可以使用MKMapView自己的位置管理器來返回用戶當前位置以傳遞到Web服務？

我有mapView.showsUserLocation=YES;，這確實在我的位置返回一個有效的藍點，但在模擬器，其Cupertino的 - 這是很好的，但是當我看到

mapView.userLocation.coordinate.latitude，它等於180，而CLLocationManager返回正確的一個，37.3317。

我想避免爲我的三個選項卡使用多個位置管理器，因此使用mapViews將會很有幫助。

謝謝。

Answer 1

您可以獲得從的MKMapView用戶位置。你只是在檢索它時錯過了一個屬性。它應該是：

mapView.userLocation.location.coordinate.latitude; 

userLocation只存儲一個CLLocation位置屬性和一個BOOL更新屬性。你必須去位置屬性來獲得座標。

-DREW

編輯：的MKMapView的用戶位置不更新，直到地圖加載完成，並檢查太早將返回零。爲了避免這種情況，我建議使用MKMapViewDelegate方法 -(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation。

Answer 2

因此，使用獨特的CLLocateManager，你可以創建一個類是委託你的地圖，這樣，而不是做：

self.locationManager = [[CLLocationManager alloc] init]; 
    _locationManager.delegate = self;

做這樣的事情：

self.locationManager = [[CLLocationManager alloc] init]; 
    _locationManager.delegate = mySharedDelegate;

其中mySharedDelegate是具有所有CLLocationManager委託方法的類。

你只能得到該用戶位置的有效協調，中

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

第一通話後，當這個方法被調用這是因爲GPS已經找到了新的位置，讓藍色圓點將被移動到那裏並且userLocation將具有新的座標。

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
    NSLog(@"---------- locationManager didUpdateToLocation"); 
    location=newLocation.coordinate; 

    NSLog(@"Location after calibration, user location (%f, %f)", _mapView.userLocation.coordinate.latitude, _mapView.userLocation.coordinate.longitude); 
}

你有這個想法：

的時候才發現

用下面的方法對你CLLocationManager委託記錄當前位置？

乾杯，
VFN

Answer 3

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
    { 
     NSLog(@"welcome into the map view annotation"); 

     // if it's the user location, just return nil. 
     if ([annotation isKindOfClass:[MyMapannotation class]]) 
     { 
      MyMapannotation *annotation12=(MyMapannotation *)annotation; 
      // try to dequeue an existing pin view first 
      static NSString* AnnotationIdentifier = @"AnnotationIdentifier"; 
      MKPinAnnotationView* pinView = [[MKPinAnnotationView alloc] 
              initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] ; 
      pinView.animatesDrop=YES; 
      pinView.canShowCallout=YES; 
      pinView.pinColor=MKPinAnnotationColorPurple; 
      pinView.tag=annotation12.tag; 

      UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
      [rightButton setTitle:annotation.title forState:UIControlStateNormal]; 
      rightButton.tag=annotation12.tag; 
      [rightButton addTarget:self 
          action:@selector(showDetails:) 
        forControlEvents:UIControlEventTouchUpInside]; 
      pinView.rightCalloutAccessoryView = rightButton; 
      UIImageView *profileIconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"artpin"]]; 
      pinView.image = profileIconView.image; 
      return pinView; 
     } 
     else 
      return nil; 
    } 

    -(IBAction)showDetails:(id)sender 
    { 
     UIButton *btn=(UIButton *)sender; 

    } 


    -(void)Load_mapview 
    { 


     for (int i=0; i<[arr_nearby count]; i++) 
     { 
      NSNumber *latitude = [[[[arr_nearby objectAtIndex:i] valueForKey:@"geometry"] valueForKey:@"location"] valueForKey:@"lat"]; 

      NSNumber *longitude = [[[[arr_nearby objectAtIndex:i] valueForKey:@"geometry"] valueForKey:@"location"] valueForKey:@"lng"]; 

      NSString *title = [[arr_nearby objectAtIndex:i] valueForKey:@"name"]; 

      //Create coordinates from the latitude and longitude values 

      CLLocationCoordinate2D coord; 

      coord.latitude = latitude.doubleValue; 

      coord.longitude = longitude.doubleValue; 

      MyMapannotation *annotation = [[MyMapannotation alloc] initWithTitle:title AndCoordinate:coord andtag:i]; 
      [_map_nearby addAnnotation:annotation]; 


      // [annotations addObject:annotation]; 

     } 

     [self zoomToLocation]; 


    } 
    -(void)zoomToLocation 

    { 

     CLLocationCoordinate2D zoomLocation; 

     zoomLocation.latitude = [[[[[arr_nearby objectAtIndex:0] valueForKey:@"geometry"] valueForKey:@"location"] valueForKey:@"lat"] floatValue]; 

     zoomLocation.longitude= [[[[[arr_nearby objectAtIndex:0] valueForKey:@"geometry"] valueForKey:@"location"] valueForKey:@"lng"] floatValue]; 

     MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 7.5*5,7.5*5); 

     [_map_nearby setRegion:viewRegion animated:YES]; 

     [_map_nearby regionThatFits:viewRegion]; 

    } 

// 
// MyMapannotation.h 
// IOS_Googgle 
// 
// Created by Vivek Chauhan on 27/06/16. 
// Copyright (c) 2016 anand. All rights reserved. 
// 

#import <Foundation/Foundation.h> 
#import <MapKit/MapKit.h> 


@interface MyMapannotation : NSObject <MKAnnotation> 

@property (nonatomic,copy) NSString *title; 
@property (nonatomic,assign) int tag; 


@property (nonatomic, readonly) CLLocationCoordinate2D coordinate; 

-(id) initWithTitle:(NSString *) title AndCoordinate:(CLLocationCoordinate2D)coordinate andtag:(int)tagofbutton; 


@end 


// 
// MyMapannotation.m 
// IOS_Googgle 
// 
// Created by Vivek Chauhan on 27/06/16. 
// Copyright (c) 2016 anand. All rights reserved. 
// 

#import "MyMapannotation.h" 

@implementation MyMapannotation 

@synthesize coordinate=_coordinate; 

@synthesize title=_title; 
@synthesize tag=_tag; 


-(id) initWithTitle:(NSString *) title AndCoordinate:(CLLocationCoordinate2D)coordinate andtag:(int)tagofbutton 

{ 

    self = [super init]; 

    _title = title; 

    _coordinate = coordinate; 
    _tag=tagofbutton; 

    return self; 

} 
@end